An image scanning device comprises a white reference board having a uniform white color; an irradiation device including a light source unit having a light source, the light source unit configured to irradiate a reflection side of the white reference board from only one oblique direction; an image sensor configured to detect reflected light from the white reference board; and a determination device configured to determine if an attached substance exists on the white reference board based on the reflected light detected by the image sensor. The irradiation device includes a reflection board configured to rotate and to focus the light from the light source by its rotation and reflect the focused light onto a manuscript. The irradiation device is configured to irradiate uniformly the manuscript with both the light source and the reflection board when the manuscript is scanned, and to irradiate the white reference board from only one oblique direction with the light source before white reference data are generated from the white reference board.
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1. An image scanning device, comprising: a white reference board having a uniform white color; an irradiation device having a light source unit, the light source unit being configured to irradiate a reflection side of the white reference board from only one oblique direction; an image sensor being configured to detect reflected light from the white reference board; and a determination device being configured to determine if an attached substance exists on the reflection side of the white reference board based on the reflected light detected by the image sensor, wherein the light source unit has a light source, the irradiation device includes a reflection board, the reflection board is configured to rotate, the reflection board is configured to focus the light from the light source by its rotation and reflects the focused light onto a manuscript, and the irradiation device is configured to irradiate uniformly the manuscript with the light source and the reflection board when image data of the manuscript are scanned, and the irradiation device is configured to irradiate the reflection side of the white reference board from only one oblique direction with the light source before white reference data are generated.
An image scanner includes a white reference board with a uniform white color for calibration. A light source shines on the white reference board from a single, angled direction. An image sensor captures the reflected light from the white reference board. A processor analyzes the reflected light to detect dust or smudges on the white reference board's surface. The scanner also uses a rotating reflector to evenly illuminate documents for normal scanning. When scanning a document, both the light source and the rotating reflector are used. But before scanning a document, the white reference board is illuminated only by the light source to generate calibration data.
2. The image scanning device according to claim 1 , further comprising a cleaning device that is configured to clean the white reference board.
The image scanner described above, which uses a white reference board and angled light to detect surface contamination and a rotating reflector to evenly illuminate documents, further incorporates a cleaning mechanism. This cleaning device is designed to automatically remove any detected dust or smudges from the surface of the white reference board, ensuring accurate calibration and image quality.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
January 5, 2009
June 18, 2013
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